Error adding to menu

I am using WordPress 3.0.1 and no matter what template i use or plugins i deactivate when i add a new menu item and try save it i get the error below – i have searched and looked and cant find any reference to the error – any help would be fantastic – thanks

Warning: Invalid argument supplied for foreach() in /usr/www/users/iepfxm/blog/wp-admin/menu.php on line 240

Warning: Invalid argument supplied for foreach() in /usr/www/users/iepfxm/blog/wp-admin/menu.php on line 303

Fatal error: [] operator not supported for strings in /usr/www/users/iepfxm/blog/wp-admin/includes/plugin.php on line 839